It is not easy to define turbulence precisely. Turbulence is a general realization of fluid flow with random, stochastic motion of the fluid particles. “It is the usual state of fluid motion except at low Reynold’s numbers” (Bradshaw 1975). Turbulence induces high shear stress on the wall and also within the flowing fluid. When the flow becomes turbulent, viscous shear stress is no longer significant. This increase of the shear stress has been attracting attention in investigations of the effects of turbulence. In the engineering flow field, this high shear stress yields a number of technical difficulties so that it is usually looked upon as a target to control. In the large arteries, therefore, turbulence has been presumed to be an intrinsically harmful event by most investigators (Browse et al. 1975).
KeywordsAortic Stenosis Turbulence Intensity Flow Disturbance Turbulence Spectrum Dimensionless Wave Number
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